Combined drill and tap



May 26, 1925. 1,539,628

J. J. BAYER COMBINED DRILL AND TAP Filed June 12, 1923 Patented May 26, 1925.

UNITED STATES JOHN J. BAYER, F BROOKLYN, NEW YORK.

COMBINED DRILL AND TAP.

Application filed .Tune 12, 1928. Serial No. 644,949.

To all whom it may concern} Be it known that I, J om? J. BAYER a citizen of theUnited-States residing at l3rookl n, in the count. of". ing's'and State of ew York, have. invented. certain new and useful Improvements in Combined" Drills and Taps; and'l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to'which it appertains to make-and the same. The invention has for its object to provide a tool which will enable an opening to be drilled and the walls of the. 0 ening threaded, thereby obviating the use 0 independent tools and separate operations, the sides of the bit mer 'ng into the sides of the tap so that the worEo drilling and threading may be continuous. I v

Other objects and advantages will be apparent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meetdifieren't conditions and requirements, various changes in the form, proportions and minor details of construction may be resorted to without departin from the nature of the invention.

Referrlng to the accom anying drawings forming a partoifthe app ication:

Figure 1 is a view inelevation of a combined drill and tap embodying the invention,

Figure 2 is a. horizontal section ,onwthe line 2-2 of Figure 1, and

Figures 3, 4: and 5 are sectional views on the hnes 3'3, 4-4 and 5-5 of Figure 1, res ectively.

orresponding and like arts are referred to in the followin description and designated in the severa views of the drawings by like reference characters.

The tool comprises a stem having a shank 1 at one end and a bit 2 at the opposite end,

the intermediate portion 3 being threaded to provide the tap. The shank'l has a Morse taper and terminates in an angular portion 4 to be fitted to a chuck or other operating tool. Thebit 2 isof the ordinary twist drill form, the flutes or grooves 5'gradually decreasing in depth and width towards the threaded portion 3, whereby provision is had for additional grooves 6, whereby to provide the ordinary four thread sections of the tap. The grooves 6 have their origin in the upper or base portion of the bit and terminate at the inner end or base of the shank 1. The cutting edges of the drill point and the thread sections of the tap merge, as in- VB0 dicated most clearly in Figure 1, and as a I result the tap is gradual in its action and follows close u on the drill and asa result the work of dr1 ling an openingand threading the same is continuous.

What is claimed is:

A combined drill and tap comprising a stem having a twist drill point at one end, the grooves of which gradually decrease in depth and terminate in oppositely disposed 7 lon itudinal grooves and having other inter mediate longitudinal grooves starting at the inner end of the drill point and terminating at the inner end of the shank and having longitudinal portions separated by the longitudrnal grooves, said portions being provided with thread sections which merge into the cutting edges of the .drill point said longitudinal rooves bein of the depth and width of t e inner end s ofv the grooves of the twist drill point. I

In testimon whereof I afiix my signature in presence 0 two witnesses.

JOHN J; BAYER.

Witnesses:

. 'WALTER N. RoznLL,

EDWARD A. CHRISTIANSON. 

